Mat for audio equipment

The present invention relates to a mat for an audio device in which acoustic characteristics can be improved by laying it under an audio device such as a speaker or an amplifier.

In recent years, in the field of so-called audio systems, with the advent of digital audio equipment such as CD players and MD players, it has become possible to play and listen to high-speed, wide dynamic range music recorded on CDs, MDs, etc. It's coming.

In this case, in order to reproduce such music with as detailed and rich musical expression as possible, for example, the influence of vibration of the housing and circuit parts of audio equipment such as amplifiers and speakers of audio systems becomes a problem. It becomes.

This problem occurs not only in the case of listening to audio using a full-scale audio system, but also in the case of listening to audio using a simple mini component system or a radio cassette player.

In addition, the influence of vibration of audio equipment becomes a problem when recording at a recording site such as a CD or MD or when performing a performance output of an electronic musical instrument.

Then, in order to reduce the influence of vibration of audio equipment in music reproduction, recording, etc. as much as possible, conventionally, vibration is absorbed (silenced) by using a rubber or lead anti-vibration insulator (sound). For example, see Patent Document 1).

<patcit num="1"><text>Japanese Unexamined Patent Publication No. 2000-138988 (paragraph numbers [0008], [0019], FIGS. 1, 3)</text></patcit>

<p> In the vibration absorption using the rubber or lead vibration isolation insulator, the sound absorption characteristics do not sufficiently follow music, etc., which has a particularly high speed and a wide dynamic range, and in playback, recording, etc., amplifiers, speakers, etc. The effect of sufficiently absorbing and reducing the vibration generated in the audio equipment of the above cannot be obtained.</p><p> On the other hand, in the field of audio equipment, it is well known that aluminum (hereinafter, simply referred to as aluminum) has a high transmission speed (sound velocity) of sound waves and vibrations, and can quickly dissipate sound waves and vibrations into the atmosphere. There is.</p><p> Then, instead of the rubber or lead anti-vibration insulator, an aluminum insulator or the like is used to quickly dissipate the vibration of the audio equipment into the atmosphere instead of absorbing (sound absorbing) it, resulting in a high-speed dynamic range. It is conceivable to obtain a sufficient vibration reduction effect even for music with a wide range.</p><p> However, aluminum insulators and the like are thick plate-like bodies formed by metal processing such as casting and shaving, and are not only inexpensive and cannot be easily formed, but are also heavy and bulky and obstructive to use. Furthermore, when laid under the audio equipment, the entire flat upper surface of the audio equipment comes into contact with the bottom surface of the audio equipment, and the entire lower surface also comes into contact with the mounting table or floor of the audio equipment. The contact area with the audio device is large, and as will be described next, the vibration of the audio device is not actually dissipated promptly.</p><p> That is, assuming that the acoustic device is the vibration source A and the aluminum insulator under it is the vibration processing material B as shown in the explanatory diagram of the vibration dissipation in FIG. 44, the vibration generated in the vibration source A is shown by the arrow line. Is transmitted to the vibration processing material B and dissipated to the atmosphere (space) C from its peripheral surface, etc., but the vibration inlet surface (upper surface in contact with the vibration source A) Ba of the processing material B and the floor on the opposite side. The aluminum processing material B has a wall thickness of several centimeters or more so that the vibration outlet surface (lower surface) Bb in contact with D etc. reflects a lot of vibration and can withstand the load of the vibration source A. It is generally formed, and as a result, the vibration transmitted from the vibration source A to the vibration inlet surface of the vibration processing material B, and the vibration reflected back to the vibration processing material B from the vibration outlet surface on the opposite side are generated. It takes time for the vibration processing material B to be dissipated into the atmosphere, and in reality, the vibration generated by the vibration source A is not quickly dissipated.</p><p> Therefore, even if an aluminum insulator or the like is used, the vibration cannot be sufficiently reduced.</p><p> Therefore, the inexpensive, easy-to-form, lightweight, and unobtrusive configuration quickly and sufficiently reduces the vibration of audio equipment such as amplifiers and speakers that occurs during playback and recording, and in particular, the dynamic range at high speeds. It is desired to improve the acoustic characteristics for a wide range of music and the like.</p><p> The present invention meets such demands, is inexpensive, can be easily formed, is lightweight, thin, and has an unobtrusive configuration, so that vibration of audio equipment such as an amplifier or a speaker during playback or recording To provide a new mat for audio equipment with a high effect of improving acoustic characteristics, which is extremely quick and sufficiently dissipates and reduces compared to the case of using a conventional rubber or lead anti-vibration insulator or an aluminum insulator. The purpose.</p>

<p> In order to achieve the above object, the mat for audio equipment of the present invention is characterized in that it is formed by arranging a plurality of granules of silica gel in a single layer shape (claim 1).</p><p> At that time, each of the granules is also characterized in that the peripheral portions of the adjacent granules are adhered to each other and arranged (claim 2).</p><p> Further, each of the granules is formed by a flexible mesh sheet-like mesh substrate and a flexible thin-film adhesive substrate bonded to the mesh substrate, so that one grain is located on each mesh of the mesh substrate and the adhesive substrate is formed. It is characterized in that it is sandwiched in a state of protruding from the surface and arranged in a single layer shape (claim 3), the mesh substrate is made of mesh tape, and the adhesive substrate is made of adhesive bandage (claim 3). Four).</p><p> Further, the mat for acoustic equipment of the present invention includes a case body of a flexible pile woven fabric, and each granule is located in each mesh of the mesh-like structure of the pile woven fabric, and the pile causes the inside of the case body. It is characterized in that it is locked and arranged in a single layer shape (claim 5), and the case body is also characterized in that it is made of a pile towel (claim 6).</p><p> Next, the mat for acoustic equipment of the present invention is characterized in that it is formed by adhering a plurality of granules of silica gel in a single layer on both sides of a flexible thin-film support substrate (claimed). Item 7), at that time, the supporting substrate is characterized by being a double-sided tape (claim 8), and the double-sided tape is also characterized by having a mesh shape (claim 9).</p><p> Finally, the mat for audio equipment of the present invention is characterized in that the silica gel of each of the above-mentioned granules is coated with a carbon coating (claim 10).</p><p> Further, the mat for audio equipment of the present invention is characterized in that each of the above-mentioned granules has a spherical shape having a particle size of approximately 1 mm to 10 mm (claim 11).</p><p> Further, the mat for audio equipment of the present invention is characterized in that the silica gel of each of the above-mentioned granules is B-type (claim 12).</p><p> In the present invention, "adhesion" also includes "adhesion".</p>

<p> First, according to the invention of claim 1, the mat for an audio device is inexpensive by arranging inexpensive silica gel granules in a single layer without performing precise and expensive processing such as metal processing. Moreover, it is easily formed and light, and since silica gel is harder than aluminum, it can be laid under heavy audio equipment such as a speaker even if it is extremely thin, which is almost determined by the particle size of silica gel, and it is not bulky and disturbs. It never becomes.</p><p> Then, when the mat for an audio device having a single-layer structure of the granules is laid under the audio device such as an amplifier and a speaker, the upper end of each granule comes into contact with the bottom surface of the audio device in a point contact manner, and each grain is formed. When the lower end of the body also contacts the floor surface underneath in a point contact manner, the contact area between this mat and the audio equipment, etc. is extremely small, and the vibration generated in the housing of the audio equipment, etc. is transmitted to this mat. , Vibration reflection on the vibration inlet side (upper end of each granule) and vibration reflection on the opposite side of the vibration outlet side (lower end of each granule) are small, due to vibration reflection. Deterioration of sound quality is significantly reduced as compared with the case of using an aluminum insulator or the like.</p><p> Further, this mat is thin and is an aggregate of a plurality of granular bodies in a layered state and has a large surface area. In addition, the transmission speed of vibration such as sound waves of silicon dioxide, which is the main component of silica gel, is higher than that of aluminum. Since it is equally fast, the vibrations on the upper end side that are directly transmitted from the acoustic equipment to this mat and the vibrations that are reflected on the lower end side and indirectly transmitted to this mat are extremely quickly transmitted from the surface of each granule to the atmosphere. Dissipate inside.</p><p> Therefore, it can be formed inexpensively and easily using silica granules without performing precise and expensive processing such as metal processing, and it is lightweight and thin, and has a structure that does not interfere with use. , Vibration of audio equipment such as amplifiers and speakers can be dissipated and reduced extremely quickly and sufficiently compared to the case of using aluminum insulators, etc., and music with a wide dynamic range at high speed can be extremely delicate and rich. It is possible to provide a new mat for audio equipment that can be reproduced by musical expression and has a high effect of improving acoustic characteristics.</p><p> Further, according to the invention of claim 2, a single layer structure of each granular material can be formed by adhering the peripheral portion of each granular material of silica gel.</p><p> Next, according to the invention of claim 3, the flexible mesh sheet-like mesh substrate and the flexible thin-film adhesive substrate are bonded so as to sandwich each of the granules of silica gel, and at this time, each mesh of the mesh substrate is bonded. As a result, each of the granules is regularly arranged so that they do not come into contact with each other, and the size of each of the granules is standardized to some extent to prevent the harmony of the reproduced sound from becoming turbid. It is possible to prevent the deterioration of characteristics due to contact as much as possible, prevent the turbidity of the harmony of the reproduced sound due to the variation in the size of each granule, and form a single-layer structure of each granule. The laminate is thin and flexible, and the formed mat is thin and flexible.</p><p> Further, the upper and lower ends of each of the granules are exposed from the mesh of the mesh substrate and the adhesive substrate, and the influence on the vibration dissipation of both substrates can be prevented as much as possible.</p><p> Further, since the two substrates are bonded together by utilizing the adhesiveness of the adhesive substrate, it is easy and easy without being restricted by the solidification time when the granules are bonded to each other with an adhesive, for example. It can be easily formed (manufactured) and is practical.</p><p> Therefore, it is possible to easily form a single-layer structure of silica gel to provide a new mat for audio equipment having an extremely high effect of improving acoustic characteristics.</p><p> According to the invention of claim 4, since the mesh substrate is formed of the mesh tape and the adhesive substrate is formed of the adhesive bandage, the mat for audio equipment according to claim 3 is provided with an extremely practical configuration using a commercially available product. realizable.</p><p> Next, according to the invention of claim 5, each granule of silica gel is arranged one by one on each mesh of the mesh-like structure of the case body of the flexible pile fabric so as not to come into contact with each other. Furthermore, since the case is locked inside the case in a state of being wrapped in a net-like bag by a pile and arranged in a single layer, each granule has a higher degree of freedom than when adhering with an adhesive or an adhesive. It is highly mobile, has a large vibration-dissipating surface area, and can quickly emit sonic vibrations into the air, improving the reproducibility of high-frequency components in particular.</p><p> Further, there is an advantage that it is not necessary to bond each granular material, and a single-layer structure of each granular material can be formed regardless of the adhesive performance of each granular material.</p><p> According to the invention of claim 6, since the case body is formed of a pile towel, the mat for audio equipment of claim 5 can be realized with an extremely practical configuration using a commercially available product.</p><p> Next, according to the invention of claim 7, the mat for audio equipment is formed by a two-layer structure of silica gel granules sandwiching a support substrate, and in this case, compared to the case of the single-layer structure of claims 1 to 6. Although it becomes one layer thicker, it is sufficient to bond each granular material to the upper and lower surfaces of the support substrate in a single layer form, and it can be formed extremely easily, and it is sufficiently thinner than an aluminum insulator or the like and has a single layer structure. As in the case, it doesn't get in the way.</p><p> When this mat for audio equipment is laid under the audio equipment such as an amplifier and a speaker, the upper end of each granular material on the upper surface side of the support substrate comes into contact with the bottom surface of the audio equipment in a point contact manner, and the lower surface of the support substrate. The lower end of each of the granules on the side contacts the floor surface or the like in a point contact manner, and the contact area between the mat and the audio equipment or the like becomes extremely small. The reflection of vibration at the upper end) and the reflection of vibration at the outlet side (lower end of each granule on the lower surface side of the support substrate) are significantly reduced.</p><p> Further, since the support substrate is thin, has extremely little influence on vibration, and is flexible, it also has an effect of giving flexibility to the mat and suppressing reflections on the inlet side and the outlet side.</p><p> Therefore, as in the case of the above-mentioned single-layer structure, the amplifier and the structure can be formed inexpensively and extremely easily by using inexpensive silica gel granules, and are light and thin and do not get in the way. It is possible to provide a new mat for audio equipment having a high effect of improving acoustic characteristics by being able to dissipate and reduce vibration of audio equipment such as a speaker extremely quickly and sufficiently.</p><p> Further, according to the invention of claim 8, by using the double-sided tape as the support substrate, the mat for audio equipment having a two-layer structure can be formed more inexpensively and easily, and further, claim 9. According to the invention, since the double-sided tape has a mesh shape, the influence of the tape can be minimized and the effect of improving the acoustic characteristics can be improved.</p><p> Next, according to the invention of claim 10, since the vibration transmission rate of the carbon coated on the silica gel of each granular material is much faster than that of silica gel or aluminum, the vibration of the acoustic device is made more rapid from the surface of each spherical body. It can be dissipated into the atmosphere, and is particularly effective in reducing vibration generated by acoustic equipment in a metal housing such as aluminum, which has a high vibration transmission speed.</p><p> Next, from the practical point of view, it is preferable that each granular material has a spherical shape having a particle size of approximately 1 mm to 10 mm (claim 11), and from the audition experiment, etc., the silica gel of each granular material should be B-type. Is preferable (claim 12).</p>

Next, embodiments of the present invention will be described with reference to FIGS. 1 to 43.

&lt;First Embodiment&gt; First, a first embodiment (corresponding to claims 1 and 2) formed of a single-layer structure of silica gel granules will be described with reference to FIGS. 1 to 6.

1 is a plan view, 2 is a front view, 3 is a partially cut view, 4 is a front view of a usage example, and 5 is a bottom view of the speaker of FIG. 4 with a part removed. , FIG. 6 is an explanatory view of vibration dissipation, and as shown in FIGS. 1 and 2, in the mat 1a for audio equipment of this embodiment, a plurality of granules 2a of silica gel are arranged in a single layer. It is formed into a single-layer structure of grains.

Each of the granules 2a may be granular silica gel having various particle sizes, but from a practical point of view, it has a spherical shape having a particle size of approximately 1 mm to 10 mm, which can be easily obtained by molding powdered silica gel or the like. (Spherical silica gel) is preferable (corresponding to claim 11).

In addition, silica gel is roughly classified into A type and B type having different hygroscopic characteristics, and the granular material 2a may be either A type or B type silica gel. It is preferable to use B-type silica gel for 2a, and for example, B-type inexpensive granular (spherical) silica gel, which is widely used as a dehumidifying agent, a deodorant, etc., is suitable as the granular material 2a (corresponding to claim 12).

This is because the A type has a narrow space structure in which the absorbed moisture does not separate, while the B type has a narrow space structure that absorbs moisture, but by heating, it evaporates and the space is regenerated again. It is thought that the cause is that the B type has a shorter transmission distance of the dissipated vibration and the vibration is quickly dissipated into the atmosphere because it has a wide space structure and contains a large amount of space. Be done.

Then, as shown in FIG. 3, each of the granular bodies 2a is arranged in a single-layer structure by adhering the peripheral portions of the adjacent granular bodies 2a to each other by an adhesive or an adhesive medium 3 of an adhesive.

Therefore, the mat 1a for acoustic equipment uses inexpensive granular (spherical) silica gel granules 2a that are widely used as dehumidifiers, deodorants, etc., and adheres adjacent granular bodies 2a to each other via an adhesive medium 3. By doing so, it can be formed inexpensively and easily without performing precise and expensive processing such as metal processing. In this case, it is extremely lighter than rubber or lead anti-vibration insulators or aluminum insulators. The thickness is also extremely thin as compared with each of the above-mentioned insulators, which is determined by the thickness of the particle size of the granular material 2a.

Since silica gel is harmless to the human body and is safe even if it is accidentally swallowed, this mat 1a for audio equipment has the advantages of high safety and environmental friendliness.

Next, the mat 1a for an audio device may have an arbitrary size, and may be formed in a size corresponding to the size of the bottom surface of each audio device or the bottom surface of the leg. It is formed in a square shape with a size of 5 cm to 10 cm, and is used by arranging the required number of sheets.

Specifically, when the audio equipment is a so-called audio system speaker, as shown in FIGS. 4 and 5, the audio equipment mat is placed under each of the four corners of the bottom surface of the speaker 4, for example, the wooden box-shaped housing 4a. 1a is laid. Note that 4b in FIG. 4 is the main body unit (speaker unit) of the speaker 4, and 5 is a speaker support base such as a speaker stand mounted on the floor 6, on which a mat 1a for audio equipment is laid. Speaker 4 is located above.

At this time, silica gel is harder than aluminum, and even if the mat 1a for audio equipment is laid under a heavy audio equipment such as a speaker 4, it will not be damaged or deformed.

If an aluminum plate is laid under the speaker 4 instead of the mat 1a for audio equipment, the aluminum plate needs to have a considerable thickness to withstand the weight, and like the mat 1a for audio equipment. It cannot be formed thin.

When the mat 1a for audio equipment is laid under the speaker 4, each spherical body 2a of silica silica arranged in a single layer has the upper end of the speaker housing 4a at the four corners of the bottom surface of the speaker housing 4a. The speaker housing 4a generated by contacting the bottom surface in a point contact manner and the lower end portion contacting the upper surface of the pedestal 5 below the bottom surface in a point contact manner, for example, playing back and outputting CD, MD music, etc. from the speaker 4. The vibration of the speaker housing 4a is transmitted from the upper end of each spherical body 2a in the point contact state to the mat 1a for audio equipment at the four corners of the speaker housing 4a, and the vibration (indirect vibration) reflected from the stand 5 is in the point contact state. It is transmitted from the lower end of the spherical body 2a to the mat 1a for audio equipment.

By the way, when the vibration of ultrasonic waves, sound waves, etc. hits a vibration processing material (vibration processing material B phase, etc. in Fig. 20) that quickly dissipates sound waves such as a mat 1a for acoustic equipment or an aluminum plate, the vibration inlet surface, the inside, It is well known that vibration is reflected or damped at the vibration outlet surface opposite the inlet surface.

Then, it is considered that the effect of improving the acoustic characteristics by the vibration processing material is mainly improved as the factors that adversely affect the sound quality of the following (1) to (4) are lessened.

(1) Reflection amount of vibration on the vibration inlet surface of the vibration processing material (The larger this amount, the lower the sound quality.) (2) Vibration transmission distance of the vibration processing material, in other words, the thickness of the vibration processing material ( The thicker the thickness, the longer it takes to dissipate the vibration and the sound quality deteriorates.) (3) Atomic weight of the material constituting the vibration processing material (For a material having a large atomic weight, vibration passes through the vibration processing material and dissipates. (4) The amount of vibration reflected at the vibration outlet surface of the vibration processing material (the larger this amount, the longer it takes to dissipate the vibration, and the sound quality deteriorates.)

The mat 1a for audio equipment, which is a vibration processing material, has a small contact area with the speaker 4 and the stand 6, and reflects vibration on the vibration inlet surface (upper end of each granular body 2a) and vice versa. The reflection of vibration on the exit surface of vibration on the side (the lower end of each granular body 2a) is extremely small.

Next, since the mat 1a for audio equipment is thin and is composed of an aggregate of a plurality of granular bodies 2a in a layered state, the surface area is larger than that of an aluminum plate or the like, and the vibration of each granular body 2a is large. Silicon dioxide (SiO), which is the main component of silica gel that quickly dissipates from the surface and constitutes mat 1a.₂) Has an atomic number of 13 and is slightly heavier than aluminum (Al), but oxygen (O) has an atomic number of 8 and is lighter than aluminum (Al). 5720m / s) is slightly slower than the speed of sound of aluminum (Al) (6260m / s), but considerably faster than the speed of sound of wood (4700m / s in the fiber direction of wood mominoki).

Therefore, the mat 1a for audio equipment is superior to aluminum in all of the above factors (1) to (4), and vibrates the audio equipment such as the speaker 4 at a transmission speed of silicon dioxide as fast as aluminum. It can be rapidly released into the atmosphere from the surface of each granular material 2a.

Therefore, this mat 1a for audio equipment can be formed inexpensively and easily using inexpensive silica gel granules 2a without performing precise and expensive processing such as metal processing, and is lightweight. Due to its thin thickness and unobtrusive configuration, vibration of audio equipment such as speaker 4 can be dissipated and reduced extremely quickly and sufficiently compared to the case of using an aluminum insulator, etc., and the dynamic range at high speed. It is possible to reproduce a wide range of music with extremely detailed and rich musical expression.

The mat 1a for audio equipment is effective not only under the speaker 4 but also under various audio equipment such as an amplifier, a CD player, and an MD player. As a result, audio using a full-scale audio system is used. Not only can the acoustic characteristics of appreciation be improved, but also the acoustic characteristics of audio appreciation using a simple mini component or radio cassette player, the recording characteristics at the recording site, the performance output characteristics of electronic musical instruments, and the like can be improved.

At that time, based on the result of audition, one or more mats for audio equipment 1a may be laid under the whole or a part of the bottom surface of the audio equipment, and when the audio equipment has so-called legs. May lay a mat 1a on the bottom of all or part of the legs.

&lt;Second Embodiment&gt; Next, a second embodiment (corresponding to claims 3 and 4), which is another example of the single-layer structure, will be described with reference to FIGS. 7 to 9.

FIG. 7 is a plan view of the audio equipment mat 1aa, FIG. 8 is a back view thereof, and FIG. 9 is a front view thereof. As shown in these drawings, the audio equipment mat 1aa is a flexible mesh sheet-like mesh. The substrate 18 and the more flexible thin-film adhesive substrate 19 to be bonded to the mesh substrate 18 are bonded to each other with the granular bodies 2a interposed therebetween.

Then, in the case of this embodiment, the mesh substrate 18 is formed by cutting a commercially available glass fiber mesh tape into an appropriate length, for example, as a mesh tape for repairing holes or cracks in building materials. If the particle size of the granular material 2a is about 2 mm, each mesh 18a has a size of about 2 mm × 2 mm, the vertical and horizontal lattice widths between the mesh 18a are about 0.5 mm, and the adhesive is applied to the back surface. Has been done.

The mesh base 18 of the mat 1aa for audio equipment shown in FIGS. 7 to 9 has 6 × 6 (length × width) mesh 18a, but the mat 1aa for audio equipment has a size of about 5 cm × 5 cm, which is highly versatile. In the case where the particle size of each granular material 2a is about 2 mm, the mesh substrate 18 has about 15 × 17 meshes 18a.

Next, the adhesive substrate 19 is in the form of a thin film (thin leaf paper) having a slightly (one size) larger area than the mesh substrate 18, and in the case of this embodiment, the adhesive is applied to one surface of the thin film non-woven fabric or cheesecloth. Formed by cutting a commercially available adhesive bandage of the above to an appropriate length, it is elastic, extremely thinner and more flexible than the mesh substrate 18, and has awl holes at each position corresponding to the center of each mesh 18a. It is attached to the mesh substrate 18 in a state where small holes such as the above are formed.

Next, each granular material 2a has a relatively uniform particle size according to the size of each mesh 18a, and as described above, if the size of each mesh 18a of the mesh substrate 18 is 2 mm × 2 mm, It has a particle size of about 2 mm, and is located, for example, pressed so as to embed one grain in each mesh 18a of the mesh substrate 18.

At this time, each of the granules 2a is positioned by each mesh 18a and is easily arranged in a single layer without contacting each other, and the upper end portion is exposed. Even if the granular material 2a has a larger particle size than the mesh 18a, the mesh 18a expands due to the elasticity of the mesh substrate 18, and no problem occurs.

Further, by the above pressing, each granular material 2a expands each small hole of the adhesive substrate 19, the lower end portion of each granular material 2a protrudes from the adhesive substrate 19 and is exposed, and in this state, each granular material 2a is exposed to the adhesive substrate. It is adhered to 19 and sandwiched between both substrates 18 and 19.

Each of the granules 2a is arranged in a single layer with the upper end and the lower end exposed from the laminated body of the substrates 18 and 19, and the mat 1aa for audio equipment is laid under the speaker housing 4a and the like. In the case, for example, the vibration of the speaker housing 4a is transmitted from the upper end of each spherical body 2a in the point contact state to the mat 1aa for audio equipment, and is rapidly dissipated from the surface of each granular body 2a, according to the first embodiment. As in the case, it can be diffused and reduced extremely quickly and sufficiently, and music or the like having a high speed and a wide dynamic range can be reproduced with extremely fine and rich musical expression.

At that time, since the adhesive substrate 19 of the adhesive bandage is extremely thin, the thickness d of the adhesive portion of each of the granular bodies 2a as a whole of the mat 1aa for acoustic equipment is smaller than that when the granular bodies 2a are bonded to each other using an adhesive. , The influence of the bonded body of the substrates 18 and 19 is less than that in the case of the first embodiment, and the vibration reducing effect is further improved.

Further, each mesh 18a of the mesh substrate 18 is regularly arranged so that each of the granules 2a does not come into contact with each other, and the size of each of the granules 2a is standardized to some extent. Aggregate particles whose thickness d of the adhesive portion is increased to 2d, 3d, etc. in the horizontal direction by joining the particles 2a are not irregularly formed, and the vibration of the entire mat 1aa for audio equipment is dissipated. The time is equalized to the vibration dissipation time of each of the granular bodies 2a having the same particle size, and the deterioration of the characteristics due to the mutual contact of the respective granular bodies 2a is prevented as much as possible, and the regeneration due to the variation in the size of each granular body 2a is performed. It is possible to prevent the turbidity of the sound harmony, and the vibration reduction effect is further improved.

Further, the mat 1aa for audio equipment having a structure in which each of the granules 2a is adhered to the adhesive base 19 and sandwiched between the bases 18 and 19 maintains the rigidity such that each mesh 18a is not crushed by the mesh tape of the mesh base 18. , The adhesive band forming the adhesive substrate 19 has flexibility (flexibility), and this flexibility is not impaired as in the case of bonding with an adhesive, so that the vibration reducing effect is further improved.

When the mat 1aa for audio equipment is laid under the speaker housing or the like, either the mesh substrate 18 or 19 may be on the upper side (front side).

Next, in the mat 1aa for audio equipment, each of the granules 2a is adhered to the adhesive base material 19 to be arranged and formed in a single layer. Therefore, for example, the granules 2a are adhered to each other and arranged in a single layer. There are no restrictions such as the solidification time of the adhesive as in the case of setting and forming, that is, the production time is not limited within the solidification time, and it is not necessary to place the adhesive on a flat table until it solidifies. Therefore, there is an advantage that the degree of freedom of formation (manufacturing) is large.

Since the mesh substrate 18 is formed of a commercially available mesh tape and the adhesive substrate 19 is formed of a commercially available adhesive bandage, the mat 1aa for audio equipment can be formed with an extremely practical and inexpensive configuration using a commercially available product. ..

By the way, when the adhesive substrate 19 is not used and the granular bodies 2a are supported by sandwiching the granular bodies 2a from above and below by, for example, two mesh substrates 18, each granular body 2a is supported by the contact point with the mesh, and each of the granular bodies 2a is supported by the contact point with the mesh. Although the stability is lower than that in the case where almost the entire circumference of the granular material 2a is adhesively supported, a similar mat for audio equipment can be formed.

&lt;Third Embodiment&gt; Next, a third embodiment (corresponding to claims 5 and 6), which is still another example of the single-layer structure, will be described with reference to FIGS. 10 to 13.

FIG. 10 is a plan view of the mat 1ab for audio equipment, FIG. 11 is a back view thereof, FIG. 12 is a cut front view thereof, and FIG. 13 is an explanatory view of a locked state of granules. The equipment mat 1ab comprises a flexible pile woven case body 20.

In the case of this embodiment, the case body 20 includes a storage portion 20a formed by cutting a flexible pile towel, which is also commercially available as a so-called body towel, bath towel, etc., to a size of, for example, about 5 cm × 5 cm, and a so-called fray. This is composed of a paper-based adhesive tape, that is, a paper tape 20b, which is covered so as to sandwich the peripheral edges of the four sides of the accommodating portion 20a.

By the way, the pile towel is formed by weaving the warp threads of the pile p into the mesh-like structure g which is the pile structure (ground), and the mesh-like structure g of the case body 20 is, for example, 16 × 15 meshes 20c. Has.

Then, each granular material 2a is arranged and positioned so as to be embedded in each mesh 20c one by one, and at this time, each granular material 2a is prevented from spilling from the mesh-like texture g side, and moreover, the granular material 2a In order to prevent the particles from coming into contact with each other, it is preferable that each of the granules 2a has a diameter slightly larger than that of each mesh 20c and has a similar size. Specifically, each mesh 20c has a diameter of 2 mm × 3 mm. To the extent, each of the granules 2a has a particle size slightly larger than 2 mm.

Further, each of the granules 2a arranged so as to be embedded in each mesh 20c is locked in the case body 20 in a state of being wrapped in a net-like bag of several threads by each pile p to form a single layer. Arranged.

In order to securely lock each of the granules 2a in the case body 20, the net-shaped bag should be, for example, a pile p thread crossed in a cross shape as shown in FIG. Is preferable.

In the mat 1ab for audio equipment formed in this way, the end of each granular body 2a is exposed through each mesh 20c on the mesh-like structure g side, and the bag of each pile p is exposed on the pile p side. The end of each granular body 2a is exposed through the groove, and in this case, since each pile p is formed of several thin threads, when the mat 1ab for audio equipment is laid under the speaker housing 4a or the like, it is used. By adding the weight of the speaker housing 4a and the like, each of the granules 2a is substantially exposed at both the upper end and the lower end and arranged in a single layer, and the first and second particles are arranged in a single layer. Similar to the audio equipment mats 1a and 1aa of the embodiment, for example, the vibration of the speaker housing 4a is transmitted from the upper end of each spherical body 2a in the point contact state to the audio equipment mat 1aa, and is promptly transmitted from the surface of each granular body 2a. It dissipates and can be dissipated and reduced extremely quickly and sufficiently as in the case of the first embodiment, and it is possible to reproduce high-speed and wide dynamic range music and the like with extremely fine and rich musical expression. it can.

Further, each of the granules 2a is arranged so as not to come into contact with each other by locating one grain on each mesh 20c of the mesh-like ground structure g of the case body 20 of the flexible pile fabric, and further, the pile p forms a net shape. Since the granules 2a are locked in the case body 20 and arranged in a single layer while being wrapped in the bag, each granule 2a has a higher degree of freedom and is more mobile than when it is adhered with an adhesive or an adhesive. It is rich in vibration, has a large vibration-dissipating surface, and can quickly emit sound wave vibrations into the air, which has the advantage of improving the reproducibility of high-frequency components.

When laying the mat 1ab for audio equipment under the speaker housing, etc., each pile p is on the upper side (front side) and the mesh-like texture g is on the lower side (back side) to prevent each granular material 2a from spilling. It is preferable to set it to the side), but in some cases, the reverse may be used.

Next, this mat 1ab for acoustic equipment has an advantage that it is not necessary to bond the granular bodies 2a and the like, and a single-layer structure of the granular bodies 2a can be formed regardless of the bonding performance of the granular bodies 2a. In particular, when each granular material of silica gel coated with a carbon coating material described later is used instead of each granular material 2a, there is no problematic peeling of the coating material when bonded or the like. It is extremely effective.

Since the case body 20 is formed of a pile towel, the mat 1ab for audio equipment can be formed with an extremely practical and inexpensive configuration using a commercially available product.

Instead of using the paper tape 20b, the pile towel may be folded back and sewn to prevent "fraying".

&lt;Fourth Embodiment&gt; Next, a fourth embodiment (corresponding to claims 7 and 8) formed by a two-layer structure of silica gel granules will be described with reference to FIGS. 14 to 17.

14 is a plan view corresponding to FIG. 1, FIG. 15 is a front view of FIG. 14, FIG. 16 is a front view of a usage example corresponding to FIG. 4, and FIG. 17 is a view seen from the bottom side of the speaker 4b of FIG. is there.

Then, as shown in FIGS. 14 and 15, the mat 1b for audio equipment of this embodiment is provided on both sides (upper surface 7a, lower surface 7b) of the double-sided tape 7 as a flexible thin-film support substrate. A plurality of granules 2b similar to the granules 2a of the first embodiment are adhered in a single layer by the adhesives of 7a and 7b, and formed into a two-layer structure of silica gel via a double-sided tape 7.

In this case, as is clear from FIG. 15 and the like, the two-layer granular material 2b of the upper surface 7a and the lower surface 7b of the double-sided tape 7 equivalently forms the single-layer granular material 2a of the first embodiment. Therefore, the audio equipment mat 1b of this embodiment has a configuration in which the thickness of the audio equipment mat 1a of the first embodiment is almost doubled, but the granules are formed on both sides 7a and 7b of the double-sided tape 7. Since 2b can be easily formed by adhering them, there is an advantage that they can be produced more easily than in the case of the first embodiment in which the granules 2a are adhered to each other by the adhesive medium 3 and formed.

Then, each granular material 2b may be granular silica gel having various particle sizes as in the case of each granular material 2a of the first embodiment, but from a practical point of view, it can be easily obtained by molding powdered silica gel or the like. The obtained spherical silica gel having a particle size of approximately 1 mm to 10 mm is preferable, and either A-type or B-type silica gel may be used, but B-type silica gel is preferable. Preferably, B-type inexpensive granular (spherical) silica gel, which is widely used as a dehumidifying agent, a deodorant, or the like, is preferable as the granular material 2b.

Therefore, the mat 1b for acoustic equipment can also be metal-processed by adhering inexpensive granular (spherical) silica gel granules 2b, which are widely used as dehumidifiers and deodorants, to both sides 7a and 7b of double-sided tape 7. It can be formed inexpensively and extremely easily without performing precise and expensive processing, and it is extremely light compared to rubber and lead anti-vibration insulators and aluminum insulators, and its thickness is also aluminum. It is extremely thin compared to the insulators of, and has high safety.

Next, the audio equipment mat 1b may have an arbitrary size like the audio equipment mat 1a of the first embodiment, depending on the size of the bottom surface of each audio equipment and the bottom surface of the leg. It may be formed to a size, but in order to have versatility, it is formed into a square shape having a size of, for example, 5 cm to 10 cm, and the required number of sheets is arranged and used.

The mat 1b for audio equipment is used in the same manner as the mat 1a for audio equipment, and when the audio equipment is speaker 4, as shown in FIGS. 16 and 17, for example, a wooden box-shaped housing 4a of the speaker 4 Under each of the four corners of the bottom, a mat 1b for audio equipment is laid. In addition, in FIG. 16 and FIG. 17, the same reference numerals as those in FIGS. 4 and 5 indicate the same ones.

In this case, silica gel is harder than aluminum, and even if the mat 1b for audio equipment is laid under a heavy audio equipment such as a speaker 4, it will not be damaged.

The upper end of each spherical body 2b adhered to the upper surface 7a of the double-sided tape 7 in a single layer form is in point contact with the bottom surface of the speaker housing 4b, and each grain is adhered to the lower surface 7b of the double-sided tape 7. The lower end of the body 2b contacts the upper surface of the pedestal 5 below it in a point contact manner.

Therefore, the mat 1b for audio equipment forms the same vibration processing material as the mat 1a for audio equipment of the first embodiment.

At this time, the double-sided tape 7 is a flexible double-sided adhesive tape of a commercially available synthetic resin film, which can give flexibility to the mat 1b for acoustic equipment, and is pressed by each granular material 2b in a point contact manner. However, the surface of the pressed portion and the non-pressed portion is deformed to be uneven and does not tear, and due to this deformation, a flat surface perpendicular to the vibration transmission direction cannot be maintained, and the vibration of the speaker housing 4b. The vibration inlet surface through which is directly transmitted and the vibration outlet surface under which the indirect vibration of the reflection is transmitted are inclined in various ways depending on the position, the vibration reflection on those surfaces is further reduced, and the deterioration of sound quality due to the reflection is extremely reduced.

Further, the double-sided tape 7 has a large atomic weight of its structural material and a slow sound velocity, but its thickness is on the order of several tens of microns and is extremely thin, so that it has almost no effect on vibration transmission.

Even if you try to use aluminum with a high sound velocity instead of the double-sided tape 7, the inflexible aluminum foil is easily torn by being pressed by each granular material 2b, so in reality, the aluminum foil is used. However, it is necessary to use an aluminum plate with a thickness of several mm or more, and if such a thick aluminum plate is used, the reflection on the flat vibration inlet surface and vibration outlet surface will increase, and the sound quality will deteriorate due to the reflection. Becomes larger.

Then, for example, the vibration of the speaker housing 4b generated by reproducing and outputting CD, MD music, etc. from the speaker 4 is directly applied to the audio equipment from the upper end of each upper spherical body 2b bonded to the upper surface 7a. Vibration transmitted to the mat 1b and indirectly transmitted to the mat 1b for audio equipment from the reflection at the lower end of each of the lower granules 2b adhered to the lower surface 7b, and has the same vibration as the explanatory diagram of vibration dissipation in FIG. Occurs.

At this time, the vibration reflection of the vibration inlet surface of the mat 1b for audio equipment and the vibration outlet surface on the opposite side is small, and since it has a two-layer structure of an aggregate of a plurality of granules 2b, it is used for audio equipment. Since the surface area of the mat 1b is large and the transmission speed of vibrations such as sound waves of silicon dioxide, which is the main component of silica gel, is as fast as that of aluminum, the vibrations transmitted from the speaker 4 to the mat 1b for audio equipment. Quickly dissipates into the atmosphere.

Therefore, this mat 1b for audio equipment can be formed inexpensively and extremely easily by using inexpensive silica gel granules 2b and double-sided tape 7 without performing precise and expensive processing such as metal processing. Since it is lightweight, thin, and does not get in the way when used, the vibration of audio equipment such as speaker 4 is made of aluminum, similar to the mats 1a, 1aa, and 1ab for audio equipment of the first to third embodiments. It is possible to dissipate and reduce the amount of music extremely quickly and sufficiently as compared with the case of using an insulator or the like, and it is possible to reproduce music or the like having a high speed and a wide dynamic range with extremely fine and rich musical expression.

And, of course, this mat 1b for audio equipment is also effective by laying it under various audio equipment other than speaker 4, such as an amplifier, a CD player, and an MD player. It is possible to improve the recording characteristics of the electronic musical instrument and the performance output characteristics of the electronic musical instrument.

The double-sided tape 7 may be various flexible double-sided tapes, but in order to suppress vibration reflection more satisfactorily, it is preferable that the double-sided tape 7 has a so-called mesh, and is a flexible thin-film support. Of course, the substrate may be other than a commercially available double-sided tape.

And, by using a flexible support base such as double-sided tape 7, it is easy to carry, for example, for portable type CD players and MD players, in their storage bags together with the player for this audio equipment. When the mat 1b is stored and carried, the mat 1b is supple, so that it is easy to store and carry.

By the way, it is conceivable to use a single-sided tape instead of the double-sided tape 7 and bond the granular material 2b to the adhesive surface (one side) in a single layer to form a mat for audio equipment having a single layer structure. , The entire lower surface of the single-sided tape is in contact with the upper surface of the stand 5 in FIG. 9, for example, and there is a lot of vibration reflection at the lower end of each granular material 2b. Both the vibration (direct vibration) and the indirect vibration transmitted to the equipment mat 1b are dissipated into the atmosphere very quickly, and cannot be dissipated promptly.

&lt;Fifth Embodiment&gt; Next, a fifth embodiment (corresponding to claim 9), which is another example formed by a two-layer structure of silica gel granules, will be described with reference to FIGS. 18 and 19. .. FIG. 18 is a plan view, and FIG. 19 is a front view thereof.

The difference between the audio equipment mat 1ba of this embodiment and the audio equipment mat 1b of the fourth embodiment is that the thin-film support substrate is replaced with the double-sided tape 7 of the mat 1b, and a mesh-like double-sided tape is used. It is a point formed by (mesh tape) 21.

The double-sided tape 21 is, for example, a tape in which an adhesive is applied to both sides of an extremely thin and coarse non-woven fabric, and specifically, is commercially available as a putty-filling mesh tape for attaching wallpaper. Is.

Then, by using the so-called mesh-like perforated double-sided tape (mesh tape) 21, the surface area and thickness (average thickness of the entire mat 1ba for audio equipment) can be reduced as much as possible, which slows down the speed at which vibration is released. The influence of a certain double-sided tape 21 can be minimized, the vibration dissipation speed of the entire mat can be increased, the reproduction of high-frequency components of sound can be made smoother, and the effect of improving acoustic characteristics can be further improved. It is possible to provide a mat 1ba for audio equipment having excellent characteristics.

&lt;Sixth Embodiment&gt; Next, a sixth embodiment (corresponding to claim 10) in which the silica gel granules are coated with a carbon coating will be described with reference to FIGS. 20 to 22.

20 is a plan view similar to that of FIG. 14, FIG. 21 is a front view of FIG. 20, and FIG. 22 is a partially enlarged front view of a cut surface of FIG. 20.

Then, as shown in FIGS. 20 and 21, the mat 1c for audio equipment of this embodiment has both sides 7a and 7b on the upper surface 7a and the lower surface 7b of the double-sided tape 7 as a flexible thin-film support substrate, respectively. Instead of each of the granules 2b of the fourth embodiment, a plurality of carbon-coated granules 2c described below are adhered in a single layer to form a two-layer structure of carbon-coated silica gel. ing.

Then, as shown in FIG. 22, each granular material 2c is formed by coating, for example, a granular silica gel 8 similar to the silica gel of the granular material 2b with a thin carbon coating material 9, and the thickness of the coating material 9 is formed. Is preferably as thin as possible from the viewpoint of shortening the transmission distance of vibration as much as possible, but is actually determined from auditory characteristics, manufacturing cost, and the like.

The two-layer structure mat 1c for acoustic equipment of the granular material 2c has a carbon (C) sound velocity of 10000 m / s, an aluminum sound velocity (6260 m / s), and a silicon dioxide sound velocity (5720 m when made into crystal). Since it is much faster than / s), the vibration transmission speed in the mat is improved.

Therefore, by laying this carbon-coated audio equipment mat 1c under the audio equipment such as amplifiers and CD players equipped with an aluminum metal housing (including the chassis) that mainly has a high speed of sound, the audio equipment The vibration of each of the granules 2c is transmitted more quickly by the covering body 9 and dissipated into the atmosphere, and a remarkable improvement effect such as acoustic characteristics can be obtained. This point was confirmed from audition experiments and the like.

When laying the mat 1c for audio equipment under an aluminum chassis or the like whose bottom surface is open, it may be laid directly on the four corners of the bent edge of the lower surface of the aluminum chassis, or laid on the bottom surface of the legs at the four corners.

Then, instead of the granules 2a of the single-layer structure mats 1a, 1aa, and 1ab for audio equipment of the first to third embodiments, granules coated with a carbon coating such as the granules 2c are provided. , A single-layer carbon-coated mat for audio equipment is formed, and even if this mat is used, the same effect as that of the mat 1c for audio equipment can be obtained, and in particular, in the third embodiment. When granules coated with a carbon coating such as granules 2c are used instead of the granules 2a of the mat 1ab for audio equipment, these granules are housed in the pile fiber case 20. Therefore, it is possible to form a mat for an audio device having a single-layer structure having excellent characteristics extremely easily without peeling due to adhesion or adhesion of the carbon coating of each granular material.

By the way, even if a carbon-coated audio equipment mat such as an audio equipment mat 1c is laid under the audio equipment of a wooden housing such as a speaker or a synthetic resin housing typified by plastic, the same acoustic characteristic improvement effect can be obtained. However, since the sound velocity of wood is 4700 m / s and the sound velocity of plastic is 1950 m / s, which is slower than the sound velocity of 5720 m / s of silica gel, the effect of carbon coating is effective for these audio devices. It is not as large as an audio device with a metal housing, but rather has a slow vibration rate. Therefore, for example, when a mat 1c for an audio device is laid, a reflective surface (on the outlet surface) generated between the layers of the covering 9 and the silica gel 8. It is expected that the harmful effects of vibration reflection will appear.

Then, when we laid out mats 1b and 1c for audio equipment and conducted a trial listening experiment, we found that the mats to be laid under the audio equipment in wooden housings such as speakers and plastic housings were for audio equipment without carbon coating. It was confirmed that the mat 1b is superior to the mat 1c for audio equipment.

&lt;7th Embodiment&gt; Next, with reference to FIG. 23 and FIG. 24, regarding the seventh embodiment (corresponding to claim 10), which is another example in which the silica gel granules are coated with a carbon coating. I will explain.

FIG. 23 is a plan view similar to that of FIG. 20, and FIG. 24 is a front view of FIG. 23. In the mat 1ca for audio equipment of this embodiment, a flexible thin film-shaped support substrate is used in the sixth embodiment. This is a point formed by the mesh-shaped double-sided tape 21 of the fifth embodiment instead of the double-sided tape 7 of the mat 1c for audio equipment of the embodiment.

Therefore, the mat 1ca for audio equipment of this embodiment minimizes the influence of the double-sided tape 21 as compared with the mat 1c for audio equipment of the sixth embodiment, and increases the vibration dissipation rate of the entire mat 1ca to increase the sound sound. It is possible to provide a mat 1ca for audio equipment having better characteristics than the mat 1c for audio equipment because the reproduction of high frequency components can be made smoother and the effect of improving acoustic characteristics can be further improved.

&lt;Measurement Results&gt; Next, the measurement results when the mats 1b and 1c for audio equipment are used will be described with reference to FIGS. 25 to 30, and further, the mats 1ba and 1ca for audio equipment having a two-layer structure will be used. The measurement results when the mats 1aa and 1ca for audio equipment having a single-layer structure are used will be described with reference to FIGS. 31 to 43. As for the mat 1aa for audio equipment, each granule 2a was made into a carbon-coated granule in order to be laid under an amplifier or the like.

(1) Measurement results when mats 1b and 1c for audio equipment are used.

First, the measurement system will be described with reference to FIGS. 25 and 26.

FIG. 25 shows the configuration of the measurement system. This measuring device outputs the sample sound reproduced by the MD player 10 from the speaker 4x via the amplifier 11, and the audio device to be measured and the reproduced sound of the speaker output. It is composed of a measuring device that is taken into a waveform analysis device 13 through a microphone 12 and that observes the waveform of the reproduced sound by this device 13.

The MD player 10 has a 10 cm x 8 cm black audio equipment mat (hereinafter referred to as "B mat") 1cα formed by arranging two 5 cm x 8 cm carbon-coated black audio equipment mats 1c on the entire bottom surface. It is laid underneath and is provided on the installation stand 14.

Further, the amplifier 11 is provided on the table 14 by laying a 5 cm × 5 cm B mat 1cβ made of a mat 1c for audio equipment under each of the legs at the four corners of the bottom.

In addition, the Speaker 4x is a Rogers model number PM510 35 cm 2-way speaker for 5 cm x 5 cm white audio equipment consisting of a non-carbon coated audio equipment mat 1b under each of the bottom four corners. It is placed on the speaker stand 15 with a mat (hereinafter referred to as W mat) 1bα laid.

Next, the microphone 12 is mounted on the microphone stand 16 and provided at an appropriate position in front of the speaker 4x.

Figure 26 shows the speaker 4y used for measurement in place of the speaker 4x in Figure 25, which is a Rogers model number LS3.5A 12 cm 2-way speaker with 1.5 on each of the bottom four corners. A cm x 1.5 cm W mat 1bβ is laid, and it is installed on the artificial marble mounting stand 17 of the speaker stand 15.

By the way, W mats 1bα and 1bβ are B-type used as a commercially available deodorant on both sides of a commercially available transparent double-sided tape with a thickness of about several tens of microns, in which an acrylic adhesive is applied to both sides of a polypropylene film. It is formed by adhering granular silica gel, and B-mat 1cα and 1cβ are formed by coating W-mat 1bα and 1bβ granular silica gel with fine-grained charcoal used as a commercially available aromatic deodorant.

Next, the measurement and the result will be described.

First, for the sound system of the speaker 4x shown in Fig. 25, the tone of 5000Hz and 250ms was obtained with the mats with mats 1bα, 1cα, and 1cβ for audio equipment, and without the mats 1bα, 1cα, and 1cβ. The MD recorded repeatedly in bursts is played back by the MD player 10, the reproduced sound output from the speaker 4x via the amplifier 11 is taken into the waveform analysis device 13 through the microphone 12, and the computer waveform analysis software processing of this device 13 is performed. When the output sound form of the speaker 4x was measured, the results shown in FIGS. 27 and 28 were obtained.

Further, when the speaker 4x of FIG. 25 was replaced with the speaker 4y of FIG. 26 and the same measurement was performed, the results of FIGS. 29 and 30 were obtained.

The horizontal axis of FIGS. 27 to 30 is the time (s), and the vertical axis is the relative level. From these measurement diagrams, the state with the mat in FIGS. 27 and 29 shows the state without the mat in FIGS. 28 and 30. It was confirmed that the residual sound of unnecessary vibration at the end of the burst was shorter than that of the above, the fidelity of the reproduction of the recorded burst sound was improved, and the acoustic characteristics were improved.

(2) Measurement results when two-layer structure mats for audio equipment 1ba and 1ca and single-layer structure mats for audio equipment 1aa and 1ca are used.

First, the measurement system will be described. The large Spica system is the system of the configuration shown in Fig. 25 using the 35 cm 2-way speaker 4x, and the small Spica system is the system using the 12 cm 2-way speaker 4y. Instead of the system of, the system of the configuration shown in Fig. 25 was adopted by using a 20 cm 2-way speaker (hereinafter referred to as a 20 cm speaker) of Rogers model number LS5 / 9A for the speaker 4x.

Then, (i) no mat for audio equipment is laid at all, (ii) the mesh B mat of mat 1ca for audio equipment is laid on MD player 10 and amplifier 11, and the mat 1ba for audio equipment is laid on the speaker 4x. A state with a mat laid with a mesh W mat (hereinafter referred to as a state with a two-layer mat), (iii) A single granule 2a of a mat 1aa for audio equipment is replaced with a carbon-coated granule on the MD player 10 and the amplifier 11. A layered B mat was laid, and a speaker 4x was laid with a single layer W mat of a mat 1ab for audio equipment (hereinafter referred to as a single layer mat).

In the measurement, the tone bursts of 50Hz, 200Hz, 1000Hz, and 5000Hz are reproduced by the MD player 10 in the same manner as described above, and the reproduced sound output from the speaker 4x via the amplifier 11 is transmitted through the microphone 12 to the waveform analysis device. I took it in 13 and did it.

Then, for example, the results of FIGS. 31 to 37 were obtained for the tone burst of 1000 Hz, and the results of FIGS. 38 to 42 were obtained for the tone burst of 5000 Hz. Fig. 31, Fig. 32, and Fig. 33 are the measurement results of 1000Hz of each 20 cm speaker with no mat, with two-layer mat, and with single-layer mat, and Fig. 34, Fig. 35, and Fig. 36 are each state. The measurement results of 1000 Hz of the 35 cm speaker, Fig. 37, Fig. 38, and Fig. 39 are the measurement results of 5000 Hz of the 20 cm speaker for each state, and Fig. 40, Fig. 41, and Fig. 42 are the measurement results of 35 cm for each state. It is the measurement result of 5000Hz of the speaker.

It should be noted that these measurements were performed in different seasons from the measurements when the above-mentioned mats 1b and 1c for audio equipment were used, and the measurement environment was different, and the measurement results also included the difference.

When these measurement results were evaluated and judged by the three items of rising Va, amplification value Vb, and reverberation value Vc shown in the waveform diagram of FIG. 43, two layers of mats 1ba and 1ca for audio equipment were used rather than no mat. It was confirmed that the effect was even higher when the single-layer mats 1aa and 1ab for audio equipment were used. In addition, if the rising Va has a characteristic that is excessively larger than other parts, it is considered that there is a peculiar "squeal (sound habit)", so the evaluation is low. In addition, the larger the amplification value Vb, the louder the sound can be reproduced, so the evaluation is high. Furthermore, the smaller the reverberation value Vc and the shorter the time until its disappearance, the smaller the sound can be reproduced, so the evaluation is high.

By the way, when applied to a system of a plurality of audio devices, a portion in which metallic containers (housings) of the same material and thickness are connected by wire in series, for example, individual metal housings in which the systems are connected by wire in series. If a mat of the same type (single layer or two layers) of carbon-coated particles is used for the power supply unit and operation unit of the above, resonance may occur and the sound may become "turbid". It is considered more preferable to use different types of mats with carbon-coated particles (single-layer mat and two-layer mat).

In addition, since carbon-coated particles are electrical conductors, it is important to prevent particles from spilling from the mat 1ab as much as possible, especially when using the carbon-coated particles mat 1ab for audio equipment. It is important to prevent short circuits in electrical and electronic circuits.

In addition, especially when used for a speaker, since the reverberation affects the reverberation characteristics of the back of the speaker and the like, it is preferable not to place an uneven object on the entire circumference including the back of the speaker as much as possible.

Also, when laying this kind of mat of silica gel particles on the bottom of the speaker, if the speaker is heavy and huge, it may cause deformation of the wood that makes up the bottom of the speaker. In such a case, the speaker may be prevented from being deformed by buffering a small piece of plate material that may be deformed between the mat and the bottom surface of the speaker.

The present invention is not limited to the above-described embodiment, and various modifications other than those described above can be made without departing from the gist thereof. For example, a mat for an audio device having a single-layer structure. In 1a, a flexible adhesive resin material or the like may be used for the adhesive medium 3 to provide a gap between the granules 2a.

Further, each of the granules 2a to 2c of the mats 1a to 1ca for audio equipment preferably has a uniform particle size, but of course, there may be a variation to an extent acceptable as a silica gel product. Moreover, the shape may have the same degree of variation.

Furthermore, the gaps between the granules 2a to 2c of the mats 1a to 1ca for each audio device should be as small as possible by using a large number of particles in order to increase the vibration dissipation rate of the entire mat, but they are adjacent to each other. It is preferable that the particles do not come into contact with each other.

Next, in the single-layered mats 1aa and 1ab for audio equipment, the mesh substrate 18, the adhesive substrate 19, and the case body 20 may be flexible mesh sheets of various materials, adhesive thin bodies, and pile fibers.

Further, in the mats 1b, 1ba, 1c, 1ca for audio equipment having a two-layer structure, the support bases such as the double-sided tape 7 and the mesh tape 21 are formed of various thin double-sided tapes and mesh tapes having strong adhesive strength. Well, the material can be anything.

Further, each of the granules 2a to 2c preferably has a minimum particle size that does not lose the initial single-layer structure or two-layer structure even when the support substrate is bent, and practically, it should be approximately 1 mm to 10 mm as described above. However, it may have various particle sizes outside the range.

The mats 1a to 1c for each audio device may be laid under various audio devices, and at that time, the size and the position of laying may be arbitrary.

<figref num="1">It is a top view of the mat for audio equipment of 1st Embodiment of this invention.</figref><figref num="2">It is a front view of the mat of FIG.</figref><figref num="3">It is an enlarged cut-out view of a part of the mat of FIG.</figref><figref num="4">It is a front view of the use example of the mat of FIG.</figref><figref num="5">It is a bottom view which partially removed FIG.</figref><figref num="6">It is explanatory drawing of the vibration emission of FIG.</figref><figref num="7">It is a top view of the mat for audio equipment of the 2nd Embodiment of this invention.</figref><figref num="8">It is a back view of the mat of FIG.</figref><figref num="9">It is a front view of the mat of FIG.</figref><figref num="10">It is a top view of the mat for audio equipment of 3rd Embodiment of this invention.</figref><figref num="11">It is a back view of the mat of FIG.</figref><figref num="12">It is a partially cut front view of the mat of FIG.</figref><figref num="13">It is explanatory drawing of the granular material locked state of the mat of FIG.</figref><figref num="14">It is a top view of the mat for audio equipment of 4th Embodiment of this invention.</figref><figref num="15">It is a front view of the mat of FIG.</figref><figref num="16">It is a front view of the use example of the mat of FIG.</figref><figref num="17">It is the bottom view which partially removed FIG.</figref><figref num="18">It is a top view of the mat for audio equipment of 5th Embodiment of this invention.</figref><figref num="19">It is a front view of the mat of FIG.</figref><figref num="20">It is a top view of the mat for audio equipment of 6th Embodiment of this invention.</figref><figref num="21">It is a front view of the mat of FIG.</figref><figref num="22">It is an enlarged cut-out view of a part of the mat of FIG.</figref><figref num="23">It is a top view of the mat for audio equipment of 7th Embodiment of this invention.</figref><figref num="24">It is a front view of the mat of FIG. 23.</figref><figref num="25">It is a block diagram of an example of a characteristic measurement system.</figref><figref num="26">FIG. 5 is an explanatory diagram of another example of a speaker used in the system of FIG.</figref><figref num="27">It is a characteristic diagram of the measurement result.</figref><figref num="28">It is a characteristic diagram of the measurement result.</figref><figref num="29">It is a characteristic diagram of the measurement result.</figref><figref num="30">It is a characteristic diagram of the measurement result.</figref><figref num="31">It is a characteristic diagram of the measurement result.</figref><figref num="32">It is a characteristic diagram of the measurement result.</figref><figref num="33">It is a characteristic diagram of the measurement result.</figref><figref num="34">It is a characteristic diagram of the measurement result.</figref><figref num="35">It is a characteristic diagram of the measurement result.</figref><figref num="36">It is a characteristic diagram of the measurement result.</figref><figref num="37">It is a characteristic diagram of the measurement result.</figref><figref num="38">It is a characteristic diagram of the measurement result.</figref><figref num="39">It is a characteristic diagram of the measurement result.</figref><figref num="40">It is a characteristic diagram of the measurement result.</figref><figref num="41">It is a characteristic diagram of the measurement result.</figref><figref num="42">It is a characteristic diagram of the measurement result.</figref><figref num="43">It is explanatory drawing of the evaluation of the measurement result.</figref><figref num="44">It is explanatory drawing of the vibration emission of the conventional example.</figref>

Code description

1a, 1aa, 1ab, 1b, 1ba, 1c, 1ca, 1bα, 1bβ, 1cα, 1cβ Audio equipment mat 2a, 2b, 2c Granules 3 Adhesive medium 4, 4x, 4y Speaker 7, 21 Double-sided tape 10 MD player 11 Amplifier 18 Mesh base 18a, 20c Mesh 19 Adhesive base 20 Case body p pile g Mesh texture